Check the thermostat
Set it to COOL, lower the setpoint below the room temperature, select AUTO for the fan, and replace thermostat batteries if the display is dim or blank.
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TRY THESE SAFE CHECKS FIRST
Your AC may be asking for something simple.
These no-tools checks can rule out common thermostat, filter, airflow, and power issues. They are not a substitute for professional diagnosis, and safety always comes first.
Skip to a service requestInspect the air filter
A loaded filter can restrict airflow and contribute to poor cooling or coil icing. Replace it with the correct size and install it in the airflow direction shown on the filter.
Open the airflow path
Make sure supply registers are open, return grilles are not blocked by furniture, and interior doors are not preventing air from returning to the system.
Check the breaker once
If an HVAC breaker is tripped, reset it one time. If it trips again, leave it off and request service. Repeated resets can hide an electrical fault.
Look at the outdoor unit
With the system calling for cooling, observe whether the outdoor fan is running. Remove loose leaves or debris around the cabinet without opening it or reaching through the guard.
Look for ice or water
Ice on copper lines, a frozen cabinet, or water near the indoor unit can signal an airflow, drain, or refrigerant problem. Turn cooling off and request service if the condition persists.
STOP AND REQUEST SERVICE
Do not troubleshoot through a safety warning.
Turn the system off when it is safe to do so and request help. Do not open electrical panels, bypass safety controls, handle refrigerant, or reach into moving equipment.
- Smoke, sparks, or a burning electrical smell
- A breaker that trips again after one reset
- Loud buzzing from a unit that will not start
- Ice that returns after the system has thawed
- Standing water near electrical equipment
- A suspected refrigerant leak or hissing line
AC TROUBLESHOOTING FAQ
Quick answers before the service call.
Share what you checked in the request form. Those observations can help narrow the first diagnostic steps.
What should I check first when my AC stops cooling?
Confirm the thermostat is set to COOL below the room temperature, inspect the air filter, verify supply and return airflow, and check whether the HVAC breaker is tripped.
Should I keep resetting an AC breaker?
No. Reset a tripped HVAC breaker one time. If it trips again, leave it off and request professional service because repeated trips can indicate an electrical fault.
Can I run an air conditioner when the lines are frozen?
Turn cooling off. Continued operation with a frozen coil can worsen the problem. A dirty filter may contribute, but persistent or returning ice needs professional diagnosis.
Can a homeowner recharge AC refrigerant?
Refrigerant diagnosis, leak repair, recovery, and charging should be handled by qualified technicians. Ask for a suspected leak to be located and repaired rather than repeatedly topping off the system.
Homeowner guidance was checked against ENERGY STAR's maintenance checklist, Carrier's AC troubleshooting guide, and EPA refrigerant guidance.
READY FOR HELP?
Open service request Still hot after the safe checks?
Send a service request with the symptoms, urgency, and service address. We will follow up to arrange the next step.